Here are my ideas for the required end update. First of all I think it should be decorated: beautiful and tropical new sub-biomes, very enchanting, including one similar to the warped forest (to contextualize the fact that endermans love it so much). Maybe with the addition of new plants and items. Then I would suggest creating some inhabitants of the cities of the end: perhaps alien villagers who trade unique things. I also thought that since you have inserted the strider to cross the lava, you could invent a mob that floats from one island to another, in order to facilitate movement. An essential feature is a use for the end dragon egg: even if not a rideable dragon (which would be great and could be combined with the previous idea), at least make it a key to something, or put an effect that gives you if you keep it in your base ... Really, I think an end update is necessary.